Behringer FCV100 Dual-Foot Controller Problem on Korg Trinit

[SierraOne]

Hello guys,

Please can anyone help me with my Behringer FCV100 foot controller I am using it with my Korg Trinity V3 as an expression pedal with a TRS stereo cable plugged onto the pedal's OUTPUT 2 on CV mode all the way to the Assignable (Pedal) port on my keyboard... the problem is that when i start pressing the pedal from the zero state where it is fully depressed... the volume stays 0 for a while (nearly the first third of the range is just no volume at all) then the volume starts to grow gradually until it reaches its maximum value even before the pedal is fully pressed, although on the global settings page 1 on my trinity I have it set to Master volume I also changed the polarity (between - and +) but the same problem.

P.S: The minimum volume knob on the pedal doesn't do anything, I've tried it on 0 all the way to 10... same result.

Overall the pedal is working fine, but I feel that something is wrong on there